Mac App Launcher is positioned on center of dock in certain cases.

chrome/browser/ui/app_list/app_list_positioner_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/app_list/app_list_positioner.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ skipping 70 matching lines @@
   gfx::Point DoGetAnchorPointForScreenCorner(
       AppListPositioner::ScreenCorner corner) const {
     return positioner_->GetAnchorPointForScreenCorner(corner);
   }
 
   gfx::Point DoGetAnchorPointForShelfCorner(
       AppListPositioner::ScreenEdge shelf_edge) const {
     return positioner_->GetAnchorPointForShelfCorner(shelf_edge);
   }
 
+  gfx::Point DoGetAnchorPointForShelfCenter(
+      AppListPositioner::ScreenEdge shelf_edge) const {
+    return positioner_->GetAnchorPointForShelfCenter(shelf_edge);
+  }
+
   gfx::Point DoGetAnchorPointForShelfCursor(
       AppListPositioner::ScreenEdge shelf_edge) const {
     return positioner_->GetAnchorPointForShelfCursor(shelf_edge, cursor_);
   }
 
   AppListPositioner::ScreenEdge DoGetShelfEdge(
       const gfx::Rect& shelf_rect) const {
     return positioner_->GetShelfEdge(shelf_rect);
   }
 
@@ skipping 62 matching lines @@
 
   // Shelf on bottom. Expect app list in bottom-left corner.
   PlaceShelf(AppListPositioner::SCREEN_EDGE_BOTTOM);
   EXPECT_EQ(
       gfx::Point(kWindowWidth / 2 + kMinDistanceFromEdge,
                  kScreenHeight - kShelfSize - kWindowHeight / 2 -
                      kMinDistanceFromEdge),
       DoGetAnchorPointForShelfCorner(AppListPositioner::SCREEN_EDGE_BOTTOM));
 }
 
+TEST_F(AppListPositionerUnitTest, ShelfCenter) {
+  // Position the app list on the shelf, aligned with the shelf center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_LEFT);
+  // Shelf on left. Expect app list to be center-left.
+  EXPECT_EQ(
+      gfx::Point(83, kScreenHeight / 2),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_LEFT));
+
+  // Shelf on right. Expect app list to be center-right.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_RIGHT);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth - 83, kScreenHeight / 2),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_RIGHT));
+
+  // Shelf on top. Expect app list to be top-center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_TOP);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth / 2, 133),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_TOP));
+
+  // Shelf on bottom. Expect app list to be bottom-center.
+  PlaceShelf(AppListPositioner::SCREEN_EDGE_BOTTOM);
+  EXPECT_EQ(
+      gfx::Point(kScreenWidth / 2, kScreenHeight - 133),
+      DoGetAnchorPointForShelfCenter(AppListPositioner::SCREEN_EDGE_BOTTOM));
+}
+
 TEST_F(AppListPositionerUnitTest, ShelfCursor) {
   // Position the app list on the shelf, aligned with the mouse cursor.
 
   // Shelf on left. Expect app list in top-left corner.
   PlaceShelf(AppListPositioner::SCREEN_EDGE_LEFT);
   PlaceCursor(kCursorIgnore, kWindowAwayFromEdge);
   EXPECT_EQ(
       gfx::Point(kShelfSize + kWindowWidth / 2 + kMinDistanceFromEdge,
                  kWindowAwayFromEdge),
       DoGetAnchorPointForShelfCursor(AppListPositioner::SCREEN_EDGE_LEFT));
@@ skipping 98 matching lines @@
   EXPECT_EQ(
       kWindowAwayFromEdge - kShelfSize,
       DoGetCursorDistanceFromShelf(AppListPositioner::SCREEN_EDGE_BOTTOM));
 
   // Shelf on bottom. Cursor inside shelf; expect 0.
   PlaceShelf(AppListPositioner::SCREEN_EDGE_BOTTOM);
   PlaceCursor(kCursorIgnore, kScreenHeight - kCursorOnShelf);
   EXPECT_EQ(
       0, DoGetCursorDistanceFromShelf(AppListPositioner::SCREEN_EDGE_BOTTOM));
 }